Container bag for coiled strip material



Aug. 3, 1965 R. o. RUPP CONTAINER BAG FOR COILED STRIP MATERIAL Filed March 6. 1964 INVENTOR: RICHARD o. RUPP BY ZLAJ. M

ATT'YS United States Patent 3,198,418 CGNTAINER BAG FGR CUILED STREP MATERIAL Richard 0. Rupp, Gal; Lawn, 151., assignor to The :CIOBH- well Paper Company, Chicago, 11L, a corporation of Illinois Filed Mar. 6, 1964, Ser. No. 349,964 1 Claim. ((31. 229-40) This invention relates to container-bags for packaging large coils of strip-material, such as sheet metal, preparatory to the coils being stored and/or transported.

One of the products that presents a problem for pro tective packaging during storage and/ or transport, is coiled strip-metal, especially strips having widths in" the realm of three or more feet. Such strip-material is commonly rolled into coils of from three to four feet in diameter, and because of their size and weight these coils are palleted for ease in handling, storage and shipping. Generally, in the procedure from completed coiling to effecting their packaging, these coils have to be suspended from and handled by overhead motorized lifters for removal from the coiling stand and positioning to permit packaging.

A current procedure for packaging this kind of coiled material is to provide a two-piece wrapper formed of wide sheets of tough, flexible material such as kraft paper. One such wrapper piece is overlaid on a conventional pallet with the coil set on end on this first wrapper piece on the pallet with the axis of the coil centered on the pallet and disposed vertically. Thereupon, the exposed marginal portion of this first Wrapper piece is folded up around the lower part of the coil with portions of the wrapper folded and tucked to form several circumfercntially spaced triangular-shaped gussets extending upwardly against the side of the coil. Suitable adhesive tape is used to secure these gussets in place on the peripheral surface of the coil and then a second wrapper piece, in the form of a cylindrical cap, is overlaid on the end of the coil, and the marginal portion of the open end of this wrapper-cap is suitably secured around the base or lower end of the coil to enclose'the upwardly extending portions of the first wrapper and complete the enclosure of the coil. I Finally, two lengths of narrow strap metal are fixed around the under face of the pallet and over the top of the covered coil to secure the coil onto the pallet until an occasion arises for using the coil.

This, and other procedures for protectively packaging coils, involves tedious and expensive handling of the packaging material in the course of applying it to the coils and sealing the package.

The main objects of this invention are: to provide an improved structuring of a bag-type container for the sealed enclosing of a bulky, heavy product for storage and/or transport; to provide a hollow, closed-end, cylindrical, flexible-material bag in the form of two substantially equal semi-cylindrical sections hinged together as a clamshell to permit positioning of the two sections in upwardly-open, juxtaposed relationship for the seating of a product between them subject to the two sections of the bag being shifted into position to fully embrace and enclose the product; to provide a bag of this kind structured from tough, flexible, sheet-material with overlapping end and peripheral portions surfaced with pressuresensitive adhesive to permit quick, effective and permanent sealing of the bag over the enclosed product; and to provide a bag of this kind of such simple construction as to make very economical its marketing, extremely facile its sealing around a product, and highly durable for the protection of the sealed-in product until it is required for use.

In the accompanying drawings:

FIGURE 1 is a perspective view of a product-container- 3,198,418 Patented Aug. 3, 1965 bag constructed in accordance with this invention, with the two bag sections relatively positioned in upwardlyopen relationship to permit a large coil of strip-material, suspended from a mechanically-controlled handling device, to be set into the bag preparatory to having the bag sections brought together to enclose the coil between them;

FIG. 2 is an end view showing in full outline the two bag sections closed around the coil, and showing in broken outline the maximum open position from which one bag section may be swung over into closed position with respect to the other bag section;

' FIG. 3 is a cross-sectional view of the improved coil bag, in closed position, as viewed from the plane of the line 33 of FIG. 2;

FIG. 4 is an enlarged, fragmentary, cross-sectional detail of the corner portion of the bag shown in the broken-line circle of FIG. 3, the bag being shown as made of laminated or double thickness material;

FIG. 5 is a perspective view of the bag as shown in FIGS. 2 and 3 with the peripheral or side-wall closure flap ready to be pressed into complete sealed position;

FIG. 6 is a much-enlarged, fragmentary, cross-sectional view taken on the plane of the line 66 of FIG. 5; and

FIGS. 7 and 8 are perspective views of slightly modified forms of the end pieces of bags constructed in accordance with this invention.

The essential concept of this invention is to provide a hollow, cylindrical-shaped, closed-end, product-container bag structured from flexible material and having two semi-cylindrical sections integrally connected together for disposition of the two sections in upwardly-open, juxtaposed relationship for setting a product between the sections subject to one section being swung into superimposed position on the other section, like the closing of a clamshell, to close'an seal the bag around a product for storage and/ or transport thereof.

A product-container bag embodying the foregoing concept comprises a sheet of material it) and two pairs of seini-circularly-shaped end pieces 11, 12 and 13, 14 stitched together along portions of their respective perimeters to constitute two hingedly-connected, semi-cylindrical sections 16 and 17 having integrated, overlapping flap portions 18 and 19, respectively. a

The material from which the sheet 1i and the end sections 1142 and 1344 are formed may be of any of several kinds of presently marketed tough and readilyflexible materials. A most acceptable material is kraft paper, of around thirty pound weight, which may be laminated and/ or reinforced.

The structuring of a container bag from such material is for use primarily for enclosing large cylindrical coils 24) of comparatively Wide strip-material such as strip steel or other sheet metal furnished in coils.

The sheet of packaging material it i of a width slightly greater than the axial dimension of the coil 20 and of a length somewhat greater than the circumference of the coil 20, which is to be enclosed in the finished container bag. The semi-circularly-shaped end pieces 11-12 and 13-14 are of a radius to ensure contouring the sheet it into a container adequate for the diametrical and axial dimensions of a coil 20 which is to be enclosed in the particular bag.

The one pair of end pieces 11 and 12 have portions thereof extending beyond the respective chords 21 to provide the flaps 13. The other pair of end pieces 13 and 14 difier from the end pieces 11 and 12 only in that there is no extension beyond the respective chords 22.

As is most apparent from FIGS. 3 and 4 the sheet of material It and the respective end piece 11, 12, 13 and 14 are secured together by stitche 23 extending through their overlapping perimeters, preferably, with a double-over reinforcing strip 24. Such reinforced stitching of these pieces is continuous from end to end of the sheet it), as most clearly shown in FIG. 1, and it will be noted that this stitching includes the end edges of the sealing flap 19 so that the flanges so formed will overlap at the closure of the bag when the flap 19 is secured.

Thusly formed the two semi-cylindrical sections 16 and 17 hingedly connected together transversely of the sheet of material It), as along the line 25, may be disposed in upwardly-open, contiguous relationship for the placing of a coil 29 in the section 16, as indicated in FIG. 1, or between the sections, preparatory to having the sections swung together into closed position as shown in FIGS. 2 and 3, to completely enclose the coil 29.

The inner faces of the flaps 18, of the pair of end pieces 11 and 12, and the fiap 19 of the sheet 16', as well as the comparable overlapping areas of the pair of end pieces 13 and 14 and the other end of the sheet 16, have applied thereto thin rayers of pressure-sensitive adhesives 2s, 27, 28 and 29. Preferably, this adhesive is of the dry type that adheres only to itself.

In use, a container bag of this construction is positioned, as shown in FIG. 1, on a suitable support with the two sections 16 and 17 in upwardly-open, juxtaposed relationship. The coil 2%), suspended from a conventional overhead lifter 3G, is lowered into the section 16. After retracting the lifter Sit, the section 17 is swung on the hinge 25 over into superimposed position on the section 16 with the respective sealing flaps in overlapping relation. Applying pressure to the overlapping adhesive areas 26-28, 27-29 then effects a complete sealing of the bag around the coil 2%. It will be understood, however, that if desired the container bag, particularly in the forms of FIGS. 7 and 8, may be applied to and sealed about the coil 2 while it is still suspended by the lifter 30. In that case the core would be sealed after the lifter arms have been removed.

The modified formations of the end pieces 11, 12, 13 and 14, as shown in FIGS, 7 and 8, are designed to accommodate other methods of coil-handling than the palletized method described. In the modification of FIG. 7 the end pieces are cut out to provide central holes 31 of a diameter substantially the same as that of the core or axial opening through the coil 20. In such cases a strip 32, of the same material as that of the sheet 10, is curled as shown in the figure and inserted into the core of the coil 20. Upon being released the strip 32 will expand against the inner convolution of the coil 20 and may be secured to protect the face thereof from contact with the ambient air.

In the modification of FIG. 8 radial lines of weakening 33 are formed in the end pieces of the cylindrical bag to permit their being broken to form triangular gusset portions for projection into the coil core opening. In such a case the core liner 32 would be secured to the inwardly extending gussets.

The main advantages of this invention reside in the one-piece construction of a bag of cylindrical form whereby, like a clamshell, the bag may be readily closed about an object to be packaged and then quickly sealed; in the ease with which the improved bag may be handled and made ready to receive the object to be packaged; and in the saving of time and cost in the procedure of wrapping coils of strip-material for storage and transport directly as the coils are removed from the winding stand.

Athough several embodiments of this invention have been herein shown and described it will be understood that details of the constructions shown may b altered or omitted without departing from the spirit of the inention as defined by the following claim.

I claim:

A hollow cylindrically-shaped container made of two eon-cylindrical sections comprising, a length of tough, flexible, sheet material and pairs of flat semi-circular end pieces bonded along their semi-circular perimeters by means of a reinforcing strip to the respectively opposite margins of the sheet material to constitute two hollow, upwardly-open, juxtaposed semi-cylindrical sections hinged together along the longitudinal axis between the contiguous ends of the diametric cords of the respective pairs of said semi-circular end pieces, one of said semi-cylindrical sections having flap extending upwardly from its unbonded perimeter and the other section having a flap extending longitudinally from said sheet material, the extending flaps when closed overlap portions of said other semi-cylindrical section of the container having pressure sensitive adhesive thereon to adhesively seal the container sections together to form a closed container.

References Cited by the Examiner UNITED STATES PATENTS 189,939 4/77 Huestcd. 712,087 10/02 ONeill 229-872 728,407 5/03 Patterson 22993 2,078,446 4/ 37 Grigg 22948 7 2,883,045 4/ 59 A'bramson 22987 JOSEPH R. LECLAIR, Primary Examiner.

FRANKLIN T. GARRETT, Examiner. 

